Abrading-disk.



C. KRUG.

ABRADlNG DISK.

APPLICATION FILED JUNE 1.7. 1913.

1 1$ 1 o Patented May 18, 1915.

rnrnnr clarion.

seine-men I Specification of'Letters Patent.

Patented May 18, ii@ll5;,

Application filed June 1?;1913. Serial 1%. 774,262.

To all whom it may concern Be it known that I, CARL KRUG, a subject of the German Emperor, and resident of Frankfort-on-the-Main, Mainkur, Germany, have invented a certain new and useful improvement in Abrading-Disks, of which the following is a specification.

Abrading disks made in thin layers and particularly those of large diameter such as are used in abrading machines with rotary steel disks are liable to become broken in transport even when very carefully packed. Apart from the question of damage, the packing having regard to its bulkiness, costs a great deal compared to the cost of the disk itself. In the abrading disk forming the subject of the present invention this disadvantage is overcome, by dividing the abradlayer into parts, and securing the same on flexible foundation holding the parts By so dividing the disk it can be into an easily transportable and unkahle form.

.70 embodiments of the invention are "ated in the accompanying drawing, in

gure 1 is a plan and Fig. 2 a section the parts in-extended position, while 3 is a view of the folded disk in one ediment; Fig. 4 is a plan and Fig. 5 a on with the parts in extended position white Fig. 6 is a view of the a, ther embodiment.

in accordance with the embodiment illustrated in Figs. 1 to 3, the disk, which is formed with a central orifice, 0, consists in known manner of the abrading layer a, which in the example shown is divided by rectilinear cuts or furrows 6 into two parts i and 2, and secured, for example cemented, to the usual foundation of fibrous material f.

folded disk in In the embodiment illustrated in Figs. d to 6, the abrading layer consists of three parts 1, 2 and 3 formed by furrows b and a1, and is secured to the usual foundation of fibrous material f, for example bymeans of a layer of cement.

For despatching the disk formed in ac cordance with the first embodiment, the part 2 is folded, in the manner indicated in Fig. 3 on the part 1, so that the disk is reduced to half of its original dimensions.

For despatching a disk as shown in Fig. 4, the parts 1 and 3 are folded on the part 2 in the manner indicated in Fig. 6 so that the size of the disk is reduced to that of the part 2.

In each case a considerable increasein the resistance to fracture is obtained and much better use is made of the packing space available with a consequent reduction in the cost of packing and of transport. The sub vision of the disk has not been pair its strength in abrading.

Having described my inve that what 15 claim and desire 2/ Letters Patent of the United St Abrading disk comprising in o an abrading layer, a fonndati material to which said layer both provided with a central abrading layer being provided tral crease for allowing the fol disk, substantially as described and f3; purpose set forth.

In testimony whereofl have signed my name to this specification in the presence of two subscribing witnesses; v 1

KRUG Witnesses? JEAN German, CARL Gnu-ire; 

